> Earlier this year I was visiting friends and one of them was watching some terrible YouTube videos full of ancient alien type nonsense

He didn't need to do that - there's some really great videos full of ancient alien nonsense!

[EDIT - I actually like the ancient alien nonsense. It's no less credible than the various spirituality, religious, mystic or occult beliefs held by 90% of the planet. If you're judging someone's intelligence on whether they like to watch ancient alien theories/spiritual/religious/mystical/occult shows, then you're so disconnected from humanity that your opinion probably doesn't matter to anyone, anyway.]